Why the extremely poor sound quality in playback with itunes?

I am having problems with the sound quality of itunes music. this applies to both downloads and cd's. This problem is new, I believe, and affects bluetooth speaker, earphones, and macbook pro internal speaker. All have extremely poor playback with itunes. This Problem does not happen with playback of youtube videos.
Thanks for any advice you can give.

I would be worth playing some tracks with Quicktime so see what the quality is like there.
iTunes uses Quicktime to play music.
Also check this Apple help on audio playback problems:
http://support.apple.com/kb/TS1362

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Just tried it as I did get iLife with my Mac. GarageBand froze for the first few times I loaded it up, then I managed to get it to work. Played with the on-screen keyboard which produced perfect sound.
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Dear All,
I'd like to follow up because I think that the answer to why I am getting poor sound quality my be in how I set up my wireless network. I'd like to get some feedback about this and some help about how to correct it.
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Thank you for the reply!
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I finally threw my hands up, started a completely new project, drug the same audio file in... sounded fine. Copied / Pasted the video clips from the original, broken project and boom, eveything is fixed. Yeah, corrupted Pr file it turns out. All I had to do was start a new project and import all the old components.
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Why the extremely poor sound quality in playback with itunes?

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